A major effect of long-term weightlessness involves the loss of bone and muscle mass. Without the effects of gravity, skeletal muscle is no longer required to maintain posture and the muscle groups used in moving around in a weightless environment differ from those required in terrestrial locomotion.
Marina /ma-ri-na/ [3 sylls.] as a girls' name is pronounced mah-REE-nah. It is of Latin origin, and the meaning of Marina is from the sea. From marine. A saint's name. Shakespeare gave the name to Pericles' daughter in his play Pericles, Prince of Tyre.
Dona Marina was a slave girl he had acquired as a peace offering during the beginning of his campaign to conquer the Aztecs. Born of noble blood and named Malinali, (later pronounced Malinche) after the Aztec Goddess of Grass, she was sold into slavery at a young age.